Pneumatic valve-action.



No. 883,600. PATENTED MAR. 3l 1908.

J. WIESER.

4'PlsJEUMATC VALVE AGToNi A'YPLOATION FILED JULY 2'71907,

ber and to the ducts i and t" for cleaning and' repairing the arts. Each valve-action can thus be read y and individually examined and cleaned and tightened up when neces'-l ff'channel inthe diaphragm-block, so that a suction in the diaphragm-chamber permits the quick lifting of the dia liragm and vthe openm of the valve e1 and t e closing of the valve-c amber by the valve e2` The suction which is exerted by the wind-'chest on the diaphragm-chamber and bellows produces the instant collapsing of the bellows and the raising of thelifter and operation of the pianoaction. As soon as the opening in the musicsheet has passed the opening in the tracker the air is cut ott, so that the diaphragm vwould be slowly returned to its seat. To expedite the return of the diaphragm and valves to their normal position, the auxiliary duct is simultaneously called into action by the suction which is exerted on the underside of the diaphragm through the channels h, i", erforation il, recess t and channel i2, and t e diaphragm-chamber which is connected by the channel g with the wind-chest. As the o ening i2 is small the quick return of the diap ira m is retarded and the same returned slow j and without fluttering to its seat, the valve e being then returned to its connecting-opening and thereby all the parts returned to normalD position of rest. The atmospheric air being then exerted in the channel owing to the opening of the valve e2, the bellows is immediately expanded and returned with the lifter to its normal position.

By the auxiliary duct the return motion of the diaphragm and valves is accomplished in a steady and reliable manner without counter-pressure on the diaphragm, so that the valve-actions function in a very reliable and ettectivc manner, while hyatt-ie use of the separate detachable covering-plate for the claim as new and desire to secure by Letters A Patent:

1. In a pneumatic valve-action, the combination, with the diaphragm-block provided with an same, a diaphragm-chamber, a va ve-chamber connected by an opening with the diaphragm-chamber, a double valve supported on the diaphragm, one -valve o ening and closing the valve-chamber and t e other for closing the air-opening of'the latter, an auxiliary duct located in the diaphragm-block and provided with a centrally perforated diaphragm, and a lateral duct connecting said erforated diaphra m with the inlet-duct of t e diaphragm-bloc v 2. In a neumatic valJve-actiou, the combination o a diaphragm, a diaphragm-cham: ber, a diaphragm-block in the same, an airinlet channel in said block, valves o erated by the diaphragm, a valve-chamber tor said valves connected with the wind-chest, a bellows connected with said valve-chamber, a detachable front-wall for the diaphragmchamber, an auxiliary duct arranged in the diaphragm-block, a recess or depression having a perforated diaphragm located at the iront-end of the auxiliary duct, a closingplate for said diaphragm-depression, and a at'cral channel connecting depression with the inlet-duct in the iaphragm-block for permitting the return of the diaphragm andv valves into normal position as soon as the corresponding Opening in the tracker is closed.'v

In testimony, that'l claim the foregoing as my invention, I have signed my name in presence of two subscribipg witnesses. f

JOSEPH WVIESER.

Wvitnesses:

PAUL GoEP'EL, HENRY J. Sor-mman.

inlet-channel, of a diaphra m on the being used for Y 

